(User Zhang San's level is level 1, and his corresponding maximum cumulative download beans is 50. At this time, he has uploaded a resource A, and the price is 1 download beans. Each down friend who downloads this resource will pay Zhang San 1 download beans. , Zhang San keeps harvesting until he obtains 50 download beans, and no longer increases. By analogy, users above level 6 can get up to 100 download beans per resource.)
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